题目内容

可使用什么方法来提高牙科铸造合金的力学性能？

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金属冷加工后为什么要进行热处理？

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增强金属材料的途径有哪些？

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Corrosion()

A. only occurs beneath the surface of a metal or alloy
B. can lead to weakening of the metal or alloy
C. prevents liberation of elements from the metal or alloy
D. A and B

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Ways to ensure that an alloy consists of small(rather than large)grains include()

A. combining it with citric acid
B. adding a grain refmer
C. cooling the molten metal slowly
D. copper，osmium，and iridium

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